5а - (7а + (4а - (1 - а)))
5a-(7a+(4a-1+a))
5a-(7a+(5a-1))
5a- (7a+5a-1)
5a(12a-1)
5a - 12a+1
-7a+1
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5а - (7а + (4а - (1 - а)))
5a-(7a+(4a-1+a))
5a-(7a+(5a-1))
5a- (7a+5a-1)
5a(12a-1)
5a - 12a+1
-7a+1